forked from jenningsloy318/redfish_exporter
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
executable file
·149 lines (128 loc) · 4.09 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
package main
import (
"net/http"
"os"
"os/signal"
"syscall"
alog "github.com/apex/log"
"github.com/jenningsloy318/redfish_exporter/collector"
"github.com/jenningsloy318/redfish_exporter/config"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
var (
Version string
BuildRevision string
BuildBranch string
BuildTime string
BuildHost string
rootLoggerCtx *alog.Entry
configFile = kingpin.Flag(
"config.file",
"Path to configuration file.",
).String()
listenAddress = kingpin.Flag(
"web.listen-address",
"Address to listen on for web interface and telemetry.",
).Default(":9610").String()
sc = &config.SafeConfig{
Config: &config.Config{},
}
reloadCh chan chan error
)
func init() {
rootLoggerCtx = alog.WithFields(alog.Fields{
"app": "redfish_exporter",
})
hostname, _ := os.Hostname()
rootLoggerCtx.Infof("version %s, build reversion %s, build branch %s, build at %s on host %s", Version, BuildRevision, BuildBranch, BuildTime, hostname)
}
// define new http handleer
func metricsHandler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
registry := prometheus.NewRegistry()
target := r.URL.Query().Get("target")
if target == "" {
http.Error(w, "'target' parameter must be specified", 400)
return
}
targetLoggerCtx := rootLoggerCtx.WithField("target", target)
targetLoggerCtx.Info("scraping target host")
var targetHostConfig *config.HostConfig
var err error
if targetHostConfig, err = sc.HostConfigForTarget(target); err != nil {
targetLoggerCtx.WithError(err).Error("error getting credentials")
return
}
collector := collector.NewRedfishCollector(targetHostConfig, targetLoggerCtx)
registry.MustRegister(collector)
gatherers := prometheus.Gatherers{
prometheus.DefaultGatherer,
registry,
}
// Delegate http serving to Prometheus client library, which will call collector.Collect.
h := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
func main() {
log.AddFlags(kingpin.CommandLine)
kingpin.HelpFlag.Short('h')
kingpin.Parse()
configLoggerCtx := rootLoggerCtx.WithField("config", *configFile)
configLoggerCtx.Info("starting app")
// load config first time
if err := sc.ReloadConfig(*configFile); err != nil {
configLoggerCtx.WithError(err).Error("error parsing config file")
panic(err)
}
configLoggerCtx.WithField("operation", "sc.ReloadConfig").Info("config file loaded")
// load config in background to watch for config changes
hup := make(chan os.Signal)
reloadCh = make(chan chan error)
signal.Notify(hup, syscall.SIGHUP)
go func() {
for {
select {
case <-hup:
if err := sc.ReloadConfig(*configFile); err != nil {
configLoggerCtx.WithError(err).Error("failed to reload config file")
break
}
configLoggerCtx.WithField("operation", "sc.ReloadConfig").Info("config file reload")
case rc := <-reloadCh:
if err := sc.ReloadConfig(*configFile); err != nil {
configLoggerCtx.WithError(err).Error("failed to reload config file")
rc <- err
break
}
configLoggerCtx.WithField("operation", "sc.ReloadConfig").Info("config file reloaded")
rc <- nil
}
}
}()
http.Handle("/redfish", metricsHandler()) // Regular metrics endpoint for local Redfish metrics.
http.Handle("/metrics", promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head>
<title>Redfish Exporter</title>
</head>
<body>
<h1>redfish Exporter</h1>
<form action="/redfish">
<label>Target:</label> <input type="text" name="target" placeholder="X.X.X.X" value="1.2.3.4"><br>
<input type="submit" value="Submit">
</form>
<p><a href="/metrics">Local metrics</a></p>
</body>
</html>`))
})
rootLoggerCtx.Infof("app started. listening on %s", *listenAddress)
err := http.ListenAndServe(*listenAddress, nil)
if err != nil {
log.Fatal(err)
}
}